Photolysis of the ion pair [PtIV(NH3)5Cl]3+S2O82−: reduction of platinum(IV) induced by outer-sphere charge transfer excitation

The ion pair [PtIV(NH3)5Cl]3+S2O82− shows a S2O82− → [Pt(NH3)5Cl]3+ outer-sphere charge transfer (OSCT) absorption at λmax=267 nm. OSCT excitation leads to the reduction of Pt(IV) by S2O82− to Pt(II) with φ=3×10−3 at λirr=280 nm.